采用改进水针法对XLPE电缆进行加速水树老化试验，并对老化后的切片样本形貌进行了光学显微镜及扫描电镜(SEM)观测。结果表明：改进后的水针法能有效的在针尖电极附近生成水树缺陷，水树区域尺寸可达数百微米，缺陷内部树枝通道的截面直径尺寸为微米级。
XLPE cables were accelerated aged by an improved water-needle method, and the micro-mor-phology of the accelerated aged samples were observed by optical microscope and scanning electron mi-croscope(SEM). The results show that the improved water-needle method can effectively generate water-tree defects near the needle tips in XLPE cables. The size of the water-tree defect can attain hun-dreds of microns, and the size of the tree channel in the defects is at micron grade.
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